They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.              
A．whatB．thatC．whichD．who
C
本題考查定語從句。Which引導非限制性定語從句，代指前面的一句話。句意：他們把太多的二氧化碳排到大氣中，阻止了熱從地球逃逸到太空中。
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